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ÀWỌN OHUN WÍWỌ̀
Refined White Sugar from Raw Cane Sugar
Raw cane sugar is sucrose crystals with a sticky brown coating of molasses. Refining removes that coating and the colour to give white sugar. The crystals are first softened in a concentrated syrup (affination), then dissolved. The syrup is cleaned by carbonatation: milk of lime and carbon dioxide form calcium carbonate, which settles out and carries impurities with it. Colour is taken out with granular activated carbon. The syrup is then boiled down, cooled and seeded so the sugar crystallises, the liquor is spun off in a centrifuge, and the white crystals are dried in hot air. The left-over liquor becomes refiners' molasses. Refined sugar measures below 300 ICUMSA colour units; raw sugar is over 1,500.
Ilọsíwájú
Factory process
Ìlànà
1
1
Affination
Affination
Immerse the raw sugar crystals in a concentrated syrup. It softens and removes the sticky brown coating without dissolving the crystals. Separate the crystals from the syrup.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Raw Cane Sugar1 as requiredÀwọn irinṣẹ́ tí a nílò:
Sugar Centrifuge2
2
Dissolve
Dissolve
Dissolve the washed crystals in water to make a syrup.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi1 as required3
3
Carbonatation
Carbonatation
Add milk of lime (calcium hydroxide in water) and bubble carbon dioxide through the syrup. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. The calcium carbonate that forms takes impurities with it; filter it out.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Calcium hydroxide (ẹfun tí a pa)1 as required
Carbon Dioxide Gas1 as requiredÀwọn irinṣẹ́ tí a nílò:
Carbonatation Tank
Filter Press4
4
Decolourise
Decolourise
Pass the syrup through granular activated carbon to remove the colour.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Granular Activated Carbon1 as required5
5
Boil and crystallise
Boil and crystallise
Concentrate the syrup by boiling, then cool it and seed it with sugar crystals so the sugar crystallises out.
Àwọn irinṣẹ́ tí a nílò:
Sugar Boiling Pan6
6
Spin and dry
Spin and dry
Spin the liquor off in a centrifuge and dry the white crystals in hot air. The surplus liquor is made into refiners' molasses.
Àwọn irinṣẹ́ tí a nílò:
Sugar Centrifuge
Hot Air DryerÀwọn ohun-èlò
5- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
5- Àyè
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